The Postman's Sister)[1] is a 1970 Indian Tamil-language drama film written and directed by K. S. Gopalakrishnan.

Thabalkaran Thangai was directed by K. S. Gopalakrishnan, who also wrote the story and dialogue.

[5] The song "Karikalan Katti vaithaan Kallanai" connects Cauvery and Kollidam in an "amourous atmosphere".

[4] The following day, The Indian Express wrote, "While the picture is certainly recommendable for the absence of vulgarity and the assertion of a sense of values, it is however tedious.

The story-telling is so much like in his previous movies that KSG has fallen a prey to his technique.